<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>

</body>
<script>
    let a = ['A', 'B', 'C'];
    let s = new Set(['A','B','C']);
    let m = new Map([1,'x'],[2,'y'],[3,'z']);
    for (let x of a){
        console.log(x);
    }
</script>
</html>